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input: after reallocating a string, do not write to its old address 

The old address has become invalid, and probably does not have enough
room for the write, thus causing a crash.

This fixes https://savannah.gnu.org/bugs/?57858.

Bug existed since commit 8625609c from two days ago.
master
Benno Schulenberg 2020-02-19 18:47:22 +01:00
parent 8b2b9654ab
commit bb1a0bd86c
1 changed files with 4 additions and 3 deletions
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7
src/nano.c
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@ -1639,7 +1639,6 @@ void process_a_keystroke(void)
void inject(char *burst, size_t count)
{
size_t datalen = strlen(openfile->current->data);
char *thepoint = openfile->current->data + openfile->current_x;
#ifndef NANO_TINY
size_t original_row = 0, old_amount = 0;
@ -1667,8 +1666,10 @@ void inject(char *burst, size_t count)
/* Make room for the new bytes and copy them into the line. */
openfile->current->data = charealloc(openfile->current->data,
datalen + count + 1);
memmove(thepoint + count, thepoint, datalen - openfile->current_x + 1);
strncpy(thepoint, burst, count);
memmove(openfile->current->data + openfile->current_x + count,
openfile->current->data + openfile->current_x,
datalen - openfile->current_x + 1);
strncpy(openfile->current->data + openfile->current_x, burst, count);
#ifndef NANO_TINY
/* When the mark is to the right of the cursor, compensate its position. */